The sponge is made of PVA material, which is finely processed into various type and size. The PVA sponge is special FOAM after acetalization, foam molding and grafting polymerization: I-PVA sponge. It is a non-fiber 3-dimensional porous structure in which PVA macromolecules combined with acid sodium polystyrene side chains.
It has stable chemical structure, good biocompatibility and ...
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